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15.5 Memory allocation fails under Windows

Q: I'm running under Windows 3.X DOS box, but DJGPP complains about there not being enough DPMI memory, although virtual memory is enabled.

A: You must make sure the size of your Windows swap file can be at least 2 times the largest virtual memory size you need. Check if you have enough free disk space; if you do, run a defragger (Windows needs the swap file to be contiguous). This size is normally limited by the "virtual = 4 times free physical" rule, but you can change that by inserting the line 
      PageOverCommit=n
in the [386Enh] section of your SYSTEM.INI file. The parameter n is 4 by default, but can be set to be as large as 20.


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